From 7ecd2cd4fae3e8410c0a6620f3a83dcdbb254f02 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Mon, 4 Nov 2024 07:26:30 +0100
Subject: [PATCH] block: fix bio_split_rw_at to take zone_write_granularity
into account
Otherwise it can create unaligned writes on zoned devices.
Fixes: a805a4fa4fa3 ("block: introduce zone_write_granularity limit")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20241104062647.91160-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
block/blk-merge.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/block/blk-merge.c b/block/blk-merge.c
index cc320d9aed1a4..859875a5ee902 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -292,6 +292,14 @@ static bool bvec_split_segs(const struct queue_limits *lim,
return len > 0 || bv->bv_len > max_len;
}
+static unsigned int bio_split_alignment(struct bio *bio,
+ const struct queue_limits *lim)
+{
+ if (op_is_write(bio_op(bio)) && lim->zone_write_granularity)
+ return lim->zone_write_granularity;
+ return lim->logical_block_size;
+}
+
/**
* bio_split_rw_at - check if and where to split a read/write bio
* @bio: [in] bio to be split
@@ -354,7 +362,7 @@ split:
* split size so that each bio is properly block size aligned, even if
* we do not use the full hardware limits.
*/
- bytes = ALIGN_DOWN(bytes, lim->logical_block_size);
+ bytes = ALIGN_DOWN(bytes, bio_split_alignment(bio, lim));
/*
* Bio splitting may cause subtle trouble such as hang when doing sync
--
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